Furnace wall



c. L. MYERS FURNACE WALL Nov. 9, 1937.

Filed Jan. 25, 1937 2 bneets-Sheet l 1937. c. 1.. MYERS 2,098,430

FURNACE WALL Fi ed Jan. 25, 1937 2 Sheets$heet 2 Patented Nov. 9, 193? psi stares FURNACE WALL ies Myers, Overbrook, Pa, assignor to American Engineering Company, Philadelphia,

corporation of Pennsylvania 15 Claims.

This invention relates to furnace Walls, and more particularly to furnace walls of the fluid cooled type.

One object of the present invention is to provide a simplified and generally improved wall of the stated character having particular application to stoker furnaces.

Another and morespecific object is to provide improved fluid cooled side and rear walls for stoker furnaces consisting of two sets or series of fluid conducting tubes, each set being so constructed as to extend substantially the length of side wall, and one-half the width of said rear wall, the rearwardly disposed ends of said sets of tubes terminating in. a COl'lllllOl'l header whereby the number of header connections for the tubes is reduced to a minimum.

Other and further objects of the invention will furnace substantially along line ll of Fig. 2,

showing the construction of the fluid cooled walls comprising the present invention.

Fig. 2 is a plan View partly in section, and with portions of the furnace walls removed to show the arrangement of the tubes and headers of the fluid cooled side and rear walls.

Fig. 3 is a fragmentary plan view of a modified header construction for the rear wall of the furnace.

Fig. 4 is a longitudinal view taken through one of the retorts of a stoker furnace showing the invention applied to a stoker of the continuous ash discharge type.

Fig. 5 is a plan view partly in section, and with parts of the furnace walls removed showing the arrangement of the tubes and headers provided in the side and rear walls, and

Fig. 6 is a fragmentary plan View of the upper end of the header provided in the rear wall, showing the manner in which the tubes are attached thereto, and also the protective means for the said header and tubes.

Referring to the drawings, the numeral l indicates generally a furnace provided in the present instance with an inclined grate, multiple retort stoker 2 of a well known type. Stoker 2 consists of alternately disposed retorts 3 and tuyre rows 5 to which fuel from hoppers 5 is fed by any suitable feeding mechanism shown generally at 6. Pushers 1 provided in the bottom of each retort 2 feed the fuel to extension grates 8, whichin turn feed the fuel to dump grates 9 provided at cation January 23, 1937, Serial No. 122,014

the rearmost end of the stoker. The ashes forming on dump grates 9 may be discharged from the stoker by actuating said grates downwardly through a link and lever mechanism Ill, after a well known fashion.

The combustion chamber ll of the furnace is bounded by front and rear walls I2 and i3 respectively, and by side walls Hi and it. The areas of side walls l4 and I5, and of rear wall l3 adjacent the stoker 2, have recesses provided therein in which are mounted, in any suitable manner, fluid cooled sections it, ll and it respectively. Fluid cooled section l6 comprises a series of fluid conducting tubes l9 secured at the upper ends thereof to a substantially vertical header 20 mounted, in any suitable manner, exteriorly of front wall l2, and incline downwardly and rearwardly in substantially parallel relation with the stoker 2. The lower ends of tubes i9 are bent through an angle of substantially degrees, as shown at 2|, and then extend transversely along rear wall l3 and terminate in a substantially vertical header 22 mounted in any suitable manner in said rear wall substantially midway between side walls M and i5. Fluid cooled section ll also comprises a series of fluid cooled tubes 23 secured at the upper ends thereof to a substantially vertical header 24 also mounted, in any suitable manner, exteriorly of front wall l2, and also inclined downwardly and rearwardly similarly to the tubes IS. The lower portions of these tubes are also bent through an angle of substantially 90 degrees, as shown at 25, and then extend transversely across rear wall l3, and also terminate in header 22. Referring to Fig. 2, it will be noted that the rearwardly disposed ends of. the first and second dump grates 9 at each side of the stoker are curved to conform with the curvature of the tubes 21 and 25, so that a uniform support is provided for the ashes across the entire width of the stoker. To protect the tubes l9 and 23 from the abrasive and corrosive action of the fuel any suitable protective blocks 26 may be provided. These blocks may be of the general type shown and described in United States Patent No. 2,002,276, or of any other suitable construction. The header 22 and the portions of the tubes adjacent thereto may also be provided with protective blocks 27', as shown in Fig. 2. Header 22 may be connected to the boiler (not shown) by a downtake connection 28, while headers 20 and 24 may be connected to the boiler by uptake connections. 29 and 39 respectively.

From the foregoing description it is seen that simplified, as well as highly improved fluid cooled side and rear wall constructions have been provided. The tubes extending downwardly along the side walls of the furnace are so formed as to also cover an area of the rear wall, and terminate in a common lower header. This not only provides an eificient construction, but eliminates the need for more than one header for the lower ends of the tubes.

It sometimes is desirable to employ a substantially square header in the rear wall, and to this end the construction shown in Fig. 3 is provided. As therein shown it will be noted that the tubes l9 and 23 terminate at the lower'ends thereof in a rectangular header 22. Such an arrangement eliminates an additional bend in the tubes, and simplifies, to a certain extent, the method of attaching protective blocks to the tubes. The header 22, if desired, may be exposed to the furnace heat without a covering of protective material. protective blocks provided on the tubes 99 and 23 may also be eliminated in certain installations, if it is so desired.

Figs. 4 to. 6 inclusive show an alternative construction wherein the invention is applied to a furnace 3?. of the continuous ashdischarge type. Furnace 32 also comprises a stoker 33 consisting of alternately disposed retorts 34 and tuyere rows 35. Fuel is fed along the stoker by pushers 35 provided at the bottom of each of the retorts to dead plates 3? provided at the lower ends thereof, and thence to reciprocating extension grates 38, which in turn feed the consumed fuel to adjustable dump grates 39 provided at the rearmost end of the stoker. Furnace 32 also comprises front and rear walls and 4| and side walls 42 and 43. In'the present instance a portion of the front wall 49 is cooled by a series of fluid conducting tubes 24 extending downwardly from a boiler (not shown). These tubes are then bent so as to overlie the tuyere rows 35, as shown at 45, and then continued downwardly between extension grates 33 and are then bent downwardly and forwardly, as shown at 46, and terminate in a transversely disposed lower header 4! provided beneath the stoker. A second series of tubes 48 extend upwardly from header 4! in substantially parallel relation with tubes 45. These tubes also extend between certain of the extension grates 38, and then continue forwardly, as shown at 49 in cooling relation with dead plates 3?, and terminate at their upper, forwardly disposed ends in a second transversely disposed header 55. The side walls 42.and 43 are provided with fluid cooled sections 5| and 52 respectively, while the rear wall 4| is also provided with a downwardly and rearwardly inclined fluid cooled section 53. Fluid cooled section 5| and substantially one-half of section 53 consist of a series.

of fluid conducting tubes 54 connected at the upper ends thereof to a header 55. These tubes then extend downwardly in substantially parallel relation with the stoker 33, and are then bent through substantially 90 degrees, as shown at 56, and then extend transversely across section 53 in an inclined series, as shown in Figs. land 5, and terminate in a downwardlyand rearwardly inclined header 5'! provided substantially midway between the ends of the rear wall. Fluid cooled section 52 also comprises a series of fluid conducting tubes 58 secured at the upper ends thereof to a header 5?), and also extend-downwardly and rearwardly in substantially parallel relation with the stoker. The lower ends of these tubes are also bent through substantially 90 degrees, as shown at 53, and then extend transversely in an inclined series and terminate in header 51. Any suitable protective blocks all may be provided on the tubes 54 and 58, as well as on header 51.

The inclined fluid cooled section 53 is spaced from the lower end of the stoker forming therewith a discharge passage 62 through which the consumed fuel may be fed from the stoker. The discharge end 63 of this passage may be varied in size by adjusting dump plates 33. The dump plates 39, in the present instance, are mounted on a square shaft 64 and may be adjusted by means of a lever 65 secured to one end of said shaft and mounted exteriorly of side wall 42. The lever 55 has a locking detent 58 provided thereon which may enter any one of a series of notches 61 provided in a bracket 59 mounted adjacent lever 55. By such a construction it is seen that the consumed fuel or ashes may be continuously fed from the stoker. A seal is also provided by the ashes, which prevents the infiltration of air during operating periods of the furnace. Header 51 may be connected to a boiler (not shown) by a downtake connection 10 while headers 55 and 59 are respectively connected to the boiler by uptake connections H and T2. The headers 41 and 55 disposed beneath the stoker may also be connected to the boiler by downtake and uptake connections I3 and '54 respectively. It therefore is seen that the embodiment of the invention shown in Figs. 4 and 5 is also of a simplified and highly improved construction.

The embodiments of the invention herein described have been shown simply for the purpose of illustration, it being apparent that other and further modifications may be made without departing from the invention. The invention therefore is to be limited only by the scope of the claims which follow.

What is claimed is:

1. In a furnace, having front, rear and side walls, the combination of fluid cooled sections for said side and rear walls comprising, a pair of headers mounted exteriorly of said front wall, a third header mounted intermediate the ends of said rear wall, a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side walls, said tubes being bent near their rearwardly disposed ends so as to lie in abutting relation with a portion of the inner surface of said rear wall,

. and said tubes terminating in said third header.

2. In a furnace, having front, rear and side walls, the combination of fluid cooled sections for said side and rear walls comprising, a pair of headers mounted exteriorly of said front wall, a third header mounted intermediate the ends of said rear wall, a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side walls, said tubes being bent near their rearwardly disposed ends so as to lie in abutting relation with a portion of the inner surface of said rear wall, said tubes terminating in said third header, and protective means for said tubes and third header.

3. In a furnace, having front, rear and side walls, the combination-of fluid cooled sections for said side and rear walls comprising, a pair of headers mounted exteriorly of said front wall, a third header mounted intermediate the ends of said rear wall, a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner. surfaces of said side walls,

said tubes being bent near their rearwardly disposed ends so as to lie in abutting relation with a portion of the inner surface of said rearwall, said tubes terminating in said third header, protective means for said tubes and third header, and means for circulating a cooling medium through said tubes and headers.

4. In a furnace having front, rear and side walls, the combination with a stoker, of fluid cooled sections for said side and rear walls adjacent said stoker, said sections comprising a pair of headers mounted exteriorly of said front wall, a third header mounted intermediate said rear wall, and a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side walls, said tubes being bent near their rearwardly disposed ends so as to lie in abutting relation with a portion of the inner surface of said rear wall, and said tube terminating in said third header.

5. In a furnace, having front, rear and side walls, the combination with a stoker, of fluid cooled sections for said side and rear walls adjacent said stoker, said sections comprising a pair of headers mounted exteriorly of said front wall, a third header mounted intermediate said rear wall, a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side walls, said tubes being bent near their rearwardly disposed ends so as to lie in abutting relation with a portion of the inner surface of said rear wall, said tube terminating in said third header, and means provided on said tubes and third header protecting the same against the abrasive and corrosive action of the fuel fed by said stoker,

6. In a furnace having front, rear and side walls, the combination with a stoker, of fluid cooled sections for said side and rear walls adjacent said stoker, said sections comprising a pair of headers mounted exteriorly of said front wall,

a third header mounted intermediate said rearwall, a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side walls, said tubes being bent near their rearwardly disposed ends so as to lie in abutting relation with a portion of the inner surface of said rear wall, said tube terminating in said third header, means provided on said tubes and third header protecting the same against the abrasive and corrosive action of the fuel fed by said stoker, and means for circulating a cooling medium through said tubes and headers.

7. In a furnace, having front, rear and side walls, the combination of fluid cooled sections for said side and rear walls comprising, a pair of headers mounted exteriorly of said front wall, a downwardly and rearwardly inclined header mounted intermediate the ends of said rear wall, and a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side walls, said tubes being bent near the rearwardly disposed ends thereof, and extend transversely of and in substantially abutting relation with the inner surface of a portion of said rear wall, the said last mentioned portions of said tubes being arranged in a downwardly and rearwardly inclined series from top to bottom, and said tubes terminating in said third header.

8. In a furnace having front, rear and side walls, the combination of fluid cooled sections for said side and rear walls comprising, a pair of headers mounted exteriorly of said front wall, a downwardly and rearwardly inclined header mounted intermediate the ends of said rear wall, a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side walls, said tubes being bent near the rearwardly disposed ends thereof, and extend transversely of and in substantially abutting relation with the inner surface of a portion of said rear wall, the said last mentioned portions of said tubes being arranged in a downwardly and rearwardly inclined series from top to bottom, said tubes terminating in said third header, and protective means for said tubes and headers.

9. In a furnace, having front, rear and side walls, the combination of fluid cooled sections for said side and rear walls comprising, a pair of headers mounted exteriorly of said front wall, a downwardly and rearwardly inclined header mounted intermediate the ends of said rear wall, a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side walls, said tubes being bent near the rearwardly disposed ends thereof, and extend transversely of and in substantially abutting relation with the inner surface of a portion of said rear wall, the said last mentioned portions of said tubes being arranged in a downwardly and rearwardly inclined series from top to bottom, said tubes terminating in said third header, protective means for said tubes and headers, and means for circulating cooling medium through said tubes and headers.

10. In a furnace, having front, rear and side walls, the combination with an inclined grate, multiple retort underfeed stoker, of fluid cooled sections for said side and rear walls adjacent said stoker, said sections comprising a pair of substantially vertically disposed headers mounted exteriorly of said front wall, a third header mounted in said rear wall intermediate the ends thereof, a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side Walls, said tubes being disposed in substantially parallel relation with said stoker, and the lower portions thereof being bent, so as to ex tend transversely of a portion of said rear wall, and said tubes terminating in said third header.

11. In a furnace having front, rear and side Walls, the combination with a stoker, of fluid cooled sections for said side and rear walls adjacent said stoker, comprising a pair of headers mounted exteriorly of said front wall, a downwardly and rearwardly inclined header provided in the lower portion of said rear wall intermediate said side Walls, and a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers and lying in substantially abutting relation with the inner surfaces of said side walls, said tubes being bent through substantially degrees near their rearwardly disposed ends, and lying in substantially abutting relation with a portion of the inner surface of said rear wall, and said tubes terminating in said third header, the rearwardly disposed portions of said tubes being arranged in a downwardly and rearwardly inclined series from top to bottom, and the said fluid cooled portion of said rear wall being arranged in spaced relation with the rearwardly disposed end of the stoker forming a discharge passage for the refuse fed from the stoker therebetween, and means for varying the size of said passage.

12. In a furnace, having front, rear and side walls, the combination with an inclined grate, multiple retort underfeed stoker, of fluid cooled sections for said side and rear walls adjacent said stoker, the said fluid cooled section for the rear wall inclining downwardly and rearwardly and overlying a portion of the lower end of said stoker and forming therewith a passage for the refuse fed from said stoker, said fluid cooled sections comprising a pair of headers mounted exteriorly of said front wall, a downwardly and rearwardly inclined header in said rear wall, and a series of fluid conducting tubes extending rearwardly and downwardly from each of said first mentioned headers in substantially parallel relation with said stoker, and lying in abutting relation with the inner surfaces of said side walls, the lower portions of said tubes being bent so as to extend transversely over a portion of the inner surface of said rear wall and terminating in said last mentioned header.

13. In a furnace, having front, rear and side walls, the combination with an inclined grate, multiple retort underfeed stoker, of fluid cooled sections for said side and rear walls adjacent said stoker, the said fluid cooled section for the rear wall inclining downwardly and rearwardly and overlying a portion of the lower end of said stoker and forming therewith a passage for the refuse fed from said stoker, said fluid cooled sections comprising a pair of headers mounted exteriorly of said front wall, a downwardly and rearwardly inclined header in said rear wall, a series of fluid conducting tubes extending rearwardly and downwardly from each of said first mentioned headers in substantially parallel relation with said stoker, and lying in abutting relation to the inner surfaces of said side walls, the lower portions of said tubes being bent so as to extend transversely over a portion of the inner surface of said rear wall and terminating in said last mentioned header, means for feeding the refuse through said passage, and fluid conducting means mounted in cooling relation with the grates of said stoker.

14. In a furnace, having front, rear and side walls, the combination with an inclined grate, multiple retort underfeed stoker, of fluid cooled sections for said side and rear walls adjacent said stoker, the said fluid cooled section for the rear wall inclining downwardly and rearwardly and overlying a portion of the lower end of said stoker and forming therewith a passage for the refuse fed from said stoker, said fluid cooled sections comprising a pair of headers mounted exteriorly of said front wall, a downwardly and rearwardly inclined header in said rear wall, a series of fluid conducting tubes extending rearwardly and downwardly from each of said first mentioned headers in substantially parallel relation with said stoker, and lying in abutting relation with the inner surfaces of said side walls, the lower portions of said tubes being bent so as to extend transversely over a portion of the inner surface of said rear wall and terminating in said last mentioned header, fluid conducting means mounted in cooling relation with said front wall, and said last mentioned means extending downwardly over the grates of said stoker and in cooling relation therewith.

15. In a furnace, having front, rear and side walls, the combination of fluid cooled sections for said side and rear walls comprising, a pair of headers mounted exteriorly of said front wall, a third header mounted intermediate the ends of said rear wall, a series of fluid conducting tubes extending rearwardly from each of said first mentioned headers in substantially parallel relation with said side walls, said tubes being 

